Re: Is this correct?

I´m sorry but "Nobody help you!" is grammatically incorrect. "Que nadie te aydue" in English would be "I hope that nobody helps you". The way you are using que is to express a desire. This structure doesn´t work in English. In English you have to construct the entire sentence.

Re: Is this correct?

I agree with amayo, if you say "nobody help you" is incorrect. Either you would need to add an S to help or add more to the sentence, like "Nobody will help you". "Que nadie la ayude/lo ayude/te ayude" can be taken differently. It all depends if it is being said as a command. "I hope that nobody helps you" I wouldn't say is the correct either because of the word Hope in the sentence.